#include <stdio.h>
int sum(int a, int b)
{
	return (a + b);
}

int main(int argc, char * argv[])
{
	printf("6 + 9 = %d\n", sum(6, 9));
	printf("-5 + 2 = %d\n", sum(-5, 2));
	printf("3 + 4 = %d\n", sum(3, 4));
	printf("1 + (-8) = %d\n", sum(1, -8));
	return 0;
}
